The guy wasn’t supposed to touch the ark, upon pain of death, those were God’s rules and plainly stated. It was HOLY, too HOLY to touch. It was supposed to be carried on poles, not in a wagon. Two rules broken. The guy touched it and got zapped when steadying on the cart. The next time they carried it with poles.
King David wasn’t too happy with the outcome.
And the Philistines were afflicted with a plague of hemorrhoids from manhandling the ark.